Mailscanner Error "500 command unrecognized"

[sanderrrrrr]

Hi, I run Avast home (and the mailscanner) at my (web, ftp, mail, etc.) server.
Avast scanns all E-mails which are send to my server.
Since a while I've got this nasty problem: avast can not relay E-mails anymore.

If I want to send an E-mail, this error occures Error "500 command unrecognized".

If I disable the Avast mailserver and send the mail directly to my mailserver, everything works fine again.

I think the problem started 2 or 3 weeks ago. Maybe becouse of an update downloaded by Avast.

Does anybody knows the solution?

Info:
I'm running W2K pro and Avast home(newest version).

[Eddy]

Setup the mail as Avast isn't there. Check avast4.ini and make sure all settings under the [mailscanner] section are set to default. Does this solves it?

If not, upgrade to 4.5.536 and see if that solves it.

[Lisandro]

I think the problem started 2 or 3 weeks ago. Maybe becouse of an update downloaded by Avast. I'm running W2K pro and Avast home(newest version).

The version 4.5 has a new mail detection that will work automatically. Please, set up your email account just as avast does not exists. It will detect the pop3/smpt/imap ports and scan your messages. Can you make a try and see if it's ok? Thanks.

New email detection is automatic and do not require user interaction. Anyway, spam killer applications need manually change email account settings  

This is by design.
In 4.1, it was like: mail client > avast > spam killer > mail server
In 4.5, it's like: mail client > spam killer > avast > mail server